CN103051206A - Control circuit and device of power source of fresh keeping machine and control method thereof - Google Patents
Control circuit and device of power source of fresh keeping machine and control method thereof Download PDFInfo
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- CN103051206A CN103051206A CN2012105393968A CN201210539396A CN103051206A CN 103051206 A CN103051206 A CN 103051206A CN 2012105393968 A CN2012105393968 A CN 2012105393968A CN 201210539396 A CN201210539396 A CN 201210539396A CN 103051206 A CN103051206 A CN 103051206A
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Abstract
The invention discloses a control circuit and device of a power source of a fresh keeping machine and a control method thereof. The control method comprises the following steps: alternating current power input voltage is rectified by an input rectifying filter circuit and converted into direct current voltage; power output voltage is driven to be output by a driving circuit according to the direct current power input voltage; the power output voltage is detected by a voltage detection circuit, and a detection signal is output; the detection signal is read by a controller, and a control signal is output according to the amplitude of the detection signal; and the power output voltage is controlled to be output to a load by the output control circuit according to the control signal. The voltage detection circuit is arranged at a power output end, the output power and the output current of the power source of the fresh keeping machine can be limited, and the problems that the change of power voltage is large and the fresh keeping machine stands by for a long term are solved, so that the power source of the fresh keeping machine meets the requirements of the UL1310 CLASS TWO safety certificate. At the same time, the circuit and the device disclosed by the invention have simple and reliable structures, and the control method is simple and feasible.
Description
Technical field
The present invention relates to power technique fields, relate in particular to a kind of fresh-keeping device power control circuit, device and control method thereof.
Background technology
Existing field of household appliances, a lot of products all use Switching Power Supply.Fresh-keeping device switching power source control circuit commonly used usually without the Feedback of Power loop, can not control effectively to peak power output.In the very high occasion of circuit safety performance requirement, the method can not satisfy the requirement of safety certification (such as authentications such as UL1310).
In the prior art, there is following technical problem in the fresh-keeping device power control circuit:
1, power output and output current can not be controlled, the requirement (CLASS TWO requires power output less than 100W, and output current is less than 8A simultaneously) of UL1310 CLASS TWO can not be satisfied.
2, when mains voltage variations is larger (surpass+10%), the standby power drift that might make progress in time, direct damage fresh-keeping device power control circuit when stand-by time is longer affects normally use.
3, when power output is too stablized, directly connect at relay in the situation of load, can continuous operation 7 hours and do not damage power control circuit, but can burn out outer casing of power supply, do not satisfy the UL1310 authentication; When power output is unstable, directly connect at short-circuit relay in the situation of load, after the continuous operation ten minutes to 30 minutes, constantly the hocket work or do not work of fresh-keeping device power control circuit, protective tube can not blow, and can not meet UL1310 safety certification continuous operation requirement in 1 hour.
Summary of the invention
Main purpose of the present invention is to propose a kind of fresh-keeping device power control circuit, device and control method thereof, is intended to limit power output and the output current of fresh-keeping device power supply, so that the fresh-keeping device power supply meets the requirement of UL1310 CLASS TWO safety certification.
In order to achieve the above object, the present invention proposes a kind of fresh-keeping device power control circuit, this fresh-keeping device power control circuit is connected between power input and the load supplying end, comprise input rectifying filter circuit, drive circuit, controller and output control circuit, this fresh-keeping device power control circuit also comprises voltage detecting circuit;
The input of described input rectifying filter circuit is connected with described power input, the output of described input rectifying filter circuit is connected with the input of described drive circuit, the output of described drive circuit respectively with the input of described voltage detecting circuit be connected the input of output control circuit and be connected; The output of described voltage detecting circuit is connected with the test side of described controller, and the control end of described controller is connected with the control end of described output control circuit, and the output of described output control circuit is connected with described load supplying end; Wherein:
The power input voltage that described input rectifying filter circuit is used for exchanging carries out rectification, is converted to direct current;
Described drive circuit is used for the described power input voltage according to direct current, driver output electric power output voltage;
Described voltage detecting circuit is for detection of described electric power output voltage, and output detection signal;
Described controller is used for reading described detection signal, and according to the amplitude of described detection signal, output control signal;
Described output control circuit is used for according to described control signal, controls described electric power output voltage and exports to load.
Preferably, described input rectifying filter circuit comprises fuse, piezo-resistance, the first diode, the second diode, the 3rd diode, the 4th diode, the first resistance, the second resistance and the first electric capacity; Wherein:
One end of described fuse is connected with the live wire end of described power input, and the other end of described fuse is connected with the zero line side of described power input through described piezo-resistance; Described the first diode and described the second diode series arm are in parallel with described the 3rd diode and described the 4th diode series arm, and be connected across between the live wire end and zero line side of described power input, the conducting direction of described the first diode and described the second diode is opposite, and the conducting direction of described the 3rd diode and described the 4th diode is opposite; Described the first resistance and described the second resistance and described the first capacitances in series branch circuit parallel connection, described the first resistance be connected the second resistance common port and described the first diode be connected the common port of the second diode and be connected, described the first resistance be connected the first electric capacity common port and described the 3rd diode be connected the common port of the 4th diode and be connected.
Preferably, described drive circuit comprises a two-way diode, the first triode, the second triode, the 3rd resistance, the 4th resistance, the 5th diode, the 6th diode, the second electric capacity, the 3rd electric capacity, an inductor and a transformer; Wherein:
The collector electrode of described the first triode and described the first resistance be connected the common port of the second resistance and be connected, be connected in after the first coil of described the 3rd resistance and described inductor is connected mutually between the base stage and emitter of described the first triode, described the 5th diode is connected between the collector and emitter of described the first triode; Described the 4th resistance be connected the base stage that is connected in described the second triode after the second coil of inductor is connected mutually and be connected with emitter, described the 6th diode is connected between the collector and emitter of described the second triode; The input of described bidirectional diode and described the first resistance be connected the common port of the first electric capacity and be connected, output and described the 4th resistance be connected the common port of the second coil of inductor and be connected; One end of the primary coil of described transformer is through the tertiary coil of described inductor, respectively with the emitter of described the first triode be connected the collector electrode of the second triode and be connected, the other end of the primary coil of described transformer is connected with the collector electrode of described the first triode through described the second electric capacity, and is connected with the emitter of described the second triode through described the 3rd electric capacity; The two ends of the secondary coil of described transformer are connected with the input of described voltage detecting circuit.
Preferably, described voltage detecting circuit comprises output rectification filter unit and detecting unit;
The input of described output rectification filter unit is as the input of described voltage detecting circuit, be connected in the two ends of described transformer secondary output coil, the output of described output rectification filter unit is connected with the input of described detecting unit, the output of described detecting unit is connected with the test side of described controller as the output of described voltage detecting circuit; Wherein:
The described electric power output voltage that described output rectification filter unit is used for exchanging carries out rectification, is converted to direct current;
Described detecting unit is used for the described electric power output voltage of direct current is detected output detection signal.
Preferably, described output rectification filter unit comprises the 7th diode, the 8th diode, the 9th diode, the tenth diode, the second electric capacity and the 3rd resistance; Wherein:
Described the 7th diode and described the 8th diode series arm are in parallel with described the 9th diode and described the tenth diode series arm, and be connected across the two ends of described transformer secondary output coil, the conducting direction of described the 7th diode and described the 8th diode is opposite, and the conducting direction of described the 9th diode and described the tenth diode is opposite; One end of described the 4th electric capacity and described the 7th diode be connected the common port of the 8th diode and be connected, the other end and described the 9th diode be connected the common port of the tenth diode and be connected; Described the 5th resistance and described the 4th Capacitance parallel connection, a common port are connected another common end grounding as the output of described output rectification filter unit with the input of described detecting unit.
Preferably, described detecting unit comprises the 6th resistance and the 7th resistance; One end of described the 6th resistance is as the input of described detecting unit, with described the 4th electric capacity be connected a common port of the 5th resistance and be connected; One end of described the 7th resistance and the other end of described the 6th resistance, and as the output of described detecting unit, be connected the other end ground connection of described the 7th resistance with the test side of described controller.
Preferably, described output control circuit comprises the 5th electric capacity, the 6th electric capacity, a detection tube, a protection tube, the 3rd triode, a relay and auxiliary power supply end; Wherein:
One end of described the 5th electric capacity is connected with the control end of described controller, and the other end is connected with the input of described detection tube; Described the 6th electric capacity is connected in the first output and second output of described detection tube, and an end of described the 6th electric capacity is connected other end ground connection with the base stage of described the 3rd triode; The grounded emitter of described the 3rd triode, the collector electrode of described the 3rd triode respectively with the input of described protection tube be connected an end of relay and be connected; The other end of described relay be connected the output of protection tube and all be connected with described auxiliary power supply end; One contact of described relay is connected with the primary coil of described transformer, and another contact is connected with described load supplying end.
The present invention also proposes a kind of fresh-keeping device power control, this fresh-keeping device power control comprises the fresh-keeping device power control circuit, this fresh-keeping device power control circuit is connected between power input and the load supplying end, comprise input rectifying filter circuit, drive circuit, controller and output control circuit, this fresh-keeping device power control circuit also comprises voltage detecting circuit;
The input of described input rectifying filter circuit is connected with described power input, the output of described input rectifying filter circuit is connected with the input of described drive circuit, the output of described drive circuit respectively with the input of described voltage detecting circuit be connected the input of output control circuit and be connected; The output of described voltage detecting circuit is connected with the test side of described controller, and the control end of described controller is connected with the control end of described output control circuit, and the output of described output control circuit is connected with described load supplying end; Wherein:
The power input voltage that described input rectifying filter circuit is used for exchanging carries out rectification, is converted to direct current;
Described drive circuit is used for the described power input voltage according to direct current, driver output electric power output voltage;
Described voltage detecting circuit is for detection of described electric power output voltage, and output detection signal;
Described controller is used for reading described detection signal, and according to the amplitude of described detection signal, output control signal;
Described output control circuit is used for according to described control signal, controls described electric power output voltage and exports to load.
The present invention further also proposes a kind of control method of fresh-keeping device power control, and this control method may further comprise the steps:
Step S10: the input rectifying filter circuit carries out rectification with the power input voltage that exchanges, and is converted to direct current;
Step S20: drive circuit is according to the described power input voltage of direct current, driver output electric power output voltage;
Step S30: voltage detecting circuit detects described electric power output voltage, and output detection signal;
Step S40: controller reads described detection signal, and according to the amplitude of described detection signal, the output control signal;
Step S50: output control circuit is controlled described electric power output voltage and is exported to load according to described control signal.
Preferably, described step S30 comprises:
Step S31: the described electric power output voltage that the output rectification filter unit will exchange carries out rectification, is converted to direct current;
Step S32: detecting unit detects output detection signal to the described electric power output voltage of direct current.
Fresh-keeping device power control circuit, device and control method thereof that the present invention proposes are carried out rectification by the input rectifying filter circuit with the power input voltage that exchanges, and are converted to direct current; Drive circuit is according to the described power input voltage of direct current, driver output electric power output voltage; Voltage detecting circuit detects described electric power output voltage, and output detection signal; Controller reads described detection signal, and according to the amplitude of described detection signal, the output control signal; Output control circuit is controlled described electric power output voltage and is exported to load according to described control signal.The present invention increases voltage detecting circuit at power output end electric power output voltage is detected, can limit power output and the output current of fresh-keeping device power supply, the solution mains voltage variations is large, the problem of the long-term standby of fresh-keeping device, so that the fresh-keeping device power supply meets the requirement of UL1310 CLASS TWO safety certification.Simultaneously, circuit of the present invention and apparatus structure are simple and reliable, the control method simple possible.
Description of drawings
Fig. 1 is the theory diagram of fresh-keeping device power control circuit of the present invention preferred embodiment;
Fig. 2 is the theory diagram of voltage detecting circuit in the fresh-keeping device power control circuit of the present invention;
Fig. 3 is the circuit structure diagram of fresh-keeping device power control circuit of the present invention preferred embodiment;
Fig. 4 is the schematic flow sheet of the control method preferred embodiment of fresh-keeping device power control of the present invention;
Fig. 5 is the schematic flow sheet of control method step S30 one embodiment of fresh-keeping device power control of the present invention.
The realization of the object of the invention, functional characteristics and advantage are described further with reference to accompanying drawing in connection with embodiment.
Embodiment
Further specify technical scheme of the present invention below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
The present invention proposes a kind of fresh-keeping device power control circuit.
With reference to Fig. 1, Fig. 1 is the theory diagram of fresh-keeping device power control circuit 200 preferred embodiments of the present invention.
In the embodiment of the invention, fresh-keeping device power control circuit 200 is connected between power input 100 and the load supplying end 300, comprises input rectifying filter circuit 210, drive circuit 220, voltage detecting circuit 230, controller 240 and output control circuit 250.
The input of input rectifying filter circuit 210 is connected with power input 100, the output of input rectifying filter circuit 210 is connected with the input of drive circuit 220, and the output of drive circuit 220 is connected with the input that the input of voltage detecting circuit 230 is connected with output control circuit respectively; The output of voltage detecting circuit 230 is connected with the test side of controller 240, and the control end of controller 240 is connected with the control end of output control circuit 250, and the output of output control circuit 250 is connected with load supplying end 300.
Wherein, the power input voltage that input rectifying filter circuit 210 is used for exchanging carries out rectification, is converted to direct current;
The power input voltage that drive circuit 220 is used for according to direct current, the driver output electric power output voltage;
Controller 240 is used for reading detection signal, and according to the amplitude of detection signal, output control signal;
In the present embodiment, alternating current from power input 100 inputs, rectification through input rectifying filter circuit 210, alternating current is converted to direct current, after filtering, obtain again galvanic current source input voltage, and this DC power supply input voltage is input to drive circuit 220, drive circuit 220 is processed rear out-put supply output voltage to voltage detecting circuit 230 according to this DC power supply input voltage, 230 pairs of these electric power output voltages of voltage detecting circuit detect, output detection signal is to the test side of controller 240, controller 240 reads this detection signal after changing by A/D, and according to the amplitude of the detection signal that reads, judge whether to output control circuit 250 output control signals, and then whether control is to load out-put supply output voltage.
Referring to figs. 1 through Fig. 3, Fig. 1 is the theory diagram of fresh-keeping device power control circuit 200 preferred embodiments of the present invention; Fig. 2 is the theory diagram of voltage detecting circuit 230 in the fresh-keeping device power control circuit 200 of the present invention; Fig. 3 is the circuit structure diagram of fresh-keeping device power control circuit 200 preferred embodiments of the present invention.
In above-described embodiment, input rectifying filter circuit 210 comprises fuse F1, piezo-resistance ZNR1, the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the first resistance R 1, the second resistance R 2 and the first capacitor C 1.
Wherein, the end of fuse F1 is connected with the live wire end L of power input 100, and the other end of fuse F1 is connected with the zero line side N of power input 100 through piezo-resistance ZNR1; The first diode D1 and the second diode D2 series arm are in parallel with the 3rd diode D3 and the 4th diode D4 series arm, and be connected across between the live wire end L and zero line side N of power input 100, the conducting direction of the first diode D1 and the second diode D2 is opposite, and the conducting direction of the 3rd diode D3 and the 4th diode D4 is opposite; The first resistance R 1 is in parallel with the second resistance R 2 and the first capacitor C 1 series arm, the first resistance R 1 be connected resistance R 2 common port and the first diode D1 be connected the common port of diode D2 and be connected, the common port of the first resistance R 1 and the first capacitor C 1 is connected with the common port of the 3rd diode D3 and the 4th diode D4 through the 13 diode D13.
In the present embodiment; protect fresh-keeping device power control circuit 200 by fuse F1 and piezo-resistance ZNR1; it is not burnt out because of the moment sudden change of power input voltage; utilize the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4 to form rectifier bridge, power input voltage is carried out rectification.
Particularly, drive circuit 220 comprises bidirectional diode DA1, the first triode Q1, the second triode Q2, the 3rd resistance R 3, the 4th resistance R 4, the 5th diode D5, the 6th diode D6, the second capacitor C 2, the 3rd capacitor C 3, inductor TA and transformer T1, in the present embodiment, the first triode Q1 and the second triode Q2 are NPN type triode.
Wherein, the collector electrode of the first triode Q1 and the first resistance R 1 be connected the common port of resistance R 2 and be connected, after connecting mutually, the first coil TA1 of the 3rd resistance R 3 and inductor TA is connected between the base stage and emitter of the first triode Q1, the 5th diode D5 is connected between the collector and emitter of the first triode Q1, namely the negative electrode of the 5th diode D5 is connected with the collector electrode of the first triode Q1, and the anode of the 5th diode D5 is connected with the emitter of the first triode Q1; The 4th resistance R 4 is connected the base stage that is connected in the second triode Q2 after the second coil TA2 connects mutually and is connected with emitter with inductor TA, the 6th diode D6 is connected between the collector and emitter of the second triode Q2, namely the negative electrode of the 6th diode D6 is connected with the collector electrode of the second triode Q2, and the anode of the 6th diode D6 is connected with the emitter of the second triode Q2; The input of bidirectional diode DA1 and the first resistance R 1 be connected the common port of capacitor C 1 and be connected, the output of bidirectional diode DA1 and the 4th resistance R 4 are connected the common port of the second coil TA2 and are connected with inductor TA; One end of the primary coil of transformer T1 is through the tertiary coil TA3 of inductor TA, respectively with the emitter of the first triode Q1 be connected the collector electrode of triode Q2 and be connected, the other end of the primary coil of transformer T1 is connected with the collector electrode of the first triode Q1 through the second capacitor C 2, and is connected with the emitter of the second triode Q2 through the 3rd capacitor C 3; The two ends of the secondary coil of transformer T1 are connected with the input of voltage detecting circuit 230.
In the present embodiment, when beginning to power on, power input voltage drives the second triode Q2 conducting through bidirectional diode DA1, the electric current alternating current mistake that both forward and reverse directions is arranged at the tertiary coil TA3 of inductor TA afterwards, in the driving signal that the first coil TA1 and the second coil TA2 of inductor TA produce out of phase, driven the first triode Q1 and the second triode Q2 conducting; The 3rd resistance R 3 is the base stage current-limiting resistance of the first triode Q1, also impel the first coil TA1 of inductor TA to drive the first triode Q1 conducting, the 4th resistance R 4 is the base stage current-limiting resistance of the second triode Q2, also impels the second coil TA2 of inductor TA to drive the second triode Q2 conducting; Because the electric current on the tertiary coil TA3 of inductor TA constantly changes, therefore the 5th diode D5 and the 6th diode D6 are used to the first triode Q1 and the second triode Q2 that the afterflow passage is provided, and the second capacitor C 2, the 3rd capacitor C 3 and transformer T1 form the oscillating current loop.
Particularly, voltage detecting circuit 230 comprises output rectification filter unit 231 and detecting unit 232.
The input of output rectification filter unit 231 is as the input of voltage detecting circuit 230, be connected in the two ends of transformer T1 secondary coil, the output of output rectification filter unit 231 is connected with the input of detecting unit 232, the output of detecting unit 232 is connected with the test side V_DIT of controller 240 as the output of voltage detecting circuit 230.
Wherein, the electric power output voltage that output rectification filter unit 231 is used for exchanging carries out rectification, is converted to direct current;
Detecting unit 232 is used for the electric power output voltage of direct current is detected output detection signal.
In the present embodiment, the electric power output voltage that obtains from transformer T1 two ends is alternating current, after output rectification filter unit 231 carries out rectification and filtering, is converted to galvanic current, 232 pairs of these direct currents of detecting unit detect, with to controller 240 output detection signals.
Particularly, output rectification filter unit 231 comprises the 7th diode D7, the 8th diode D8, the 9th diode D9, the tenth diode D10, the 4th capacitor C 4 and the 5th resistance R 5.
Wherein, the 7th diode D7 and the 8th diode D8 series arm are in parallel with the 9th diode D9 and the tenth diode D10 series arm, and be connected across the two ends of transformer T1 secondary coil, the conducting direction of the 7th diode D7 and the 8th diode D8 is opposite, and the conducting direction of the 9th diode D9 and the tenth diode D10 is opposite; One end of the 4th capacitor C 4 is connected with the common port of the 7th diode D7 and the 8th diode D8, and the other end of the 4th capacitor C 4 is connected with the common port of the 9th diode D9 and the tenth diode D10; The 5th resistance R 5 is in parallel with the 4th capacitor C 4, one common port of the 5th resistance R 5 and 4 parallel connections of the 4th capacitor C is as the output of output rectification filter unit 231, be connected another common end grounding of the 5th resistance R 5 and 4 parallel connections of the 4th capacitor C with the input of detecting unit 232.
In the present embodiment, the 7th diode D7, the 8th diode D8, the 9th diode D9 and the tenth diode D10 are high-frequency diode, the 7th diode D7, the 8th diode D8, the 9th diode D9 and the tenth diode D10 form rectifier bridge, the electric power output voltage that exchanges is carried out rectification, the 4th capacitor C 4 and the 5th resistance R 5 form filter circuit, electric power output voltage after rectification is carried out filtering, make its stable output.
Particularly, detecting unit 232 comprises the 6th resistance R 6 and the 7th resistance R 7; One end of the 6th resistance R 6 is connected with the common port of the 4th capacitor C 4 with 5 parallel connections of the 5th resistance R through the 14 diode D14 as the input of detecting unit 232, and the 14 diode D14 guarantees not reflux through rectification and filtered electric power output voltage; One end of the 7th resistance R 7 and the other end of the 6th resistance R 6, and as the output of detecting unit 232, be connected with the test side V_DIT of controller 240, the test side V_DIT of controller 240 is the A/D mouth of controller 240, the other end ground connection of the 7th resistance R 7.
In the present embodiment, electric power output voltage by the 6th resistance R 6 and 7 pairs of direct currents behind rectifying and wave-filtering of the 7th resistance R carries out dividing potential drop, the voltage that produces in the 7th resistance R 7 is the voltage that detects, according to detected voltage, output detection signal is to controller 240, present embodiment is before exporting detection signal to controller 240, first through limiter tube D15 detection signal is carried out clamper, and carry out filtering through the 7th capacitor C 7 and 8 pairs of detection signals of the 8th capacitor C, so that detection signal is more stable; Controller 240 is single-chip microcomputer, controller 240 reads detection signal after the A/D conversion, and whether the amplitude of judging detection signal reaches the output voltage preset value, if the amplitude of detection signal reaches the voltage preset value, judge that then output power of power supply and output current normally export, the output control signal, to continue as load supplying, if the amplitude of detection signal is less than the output voltage preset value, judge that then output power of power supply surpasses the power output preset value, output current surpasses the output current preset value, does not then export control signal, the output voltage of cutting off the electricity supply output.
Particularly; output control circuit 250 comprises the 5th capacitor C 5, the 6th capacitor C 6, detection tube D11, protection tube D12, the 3rd triode Q3, relay TLY1 and auxiliary power supply end VCC; in the present embodiment; the 3rd triode Q3 is NPN type triode; the internal structure of detection tube D11 is formed by two opposite diodes in parallels of conducting direction, and the internal structure of protection tube D12 is formed by two identical diodes in parallels of conducting direction.
Wherein, an end of the 5th capacitor C 5 is connected with the control end HEAT of controller 240, and the other end of the 5th capacitor C 5 is connected with the input of detection tube D11; The 6th capacitor C 6 is connected in the first output and the second output of detection tube D11, and an end of the 6th capacitor C 6 is through the 8th resistance R 8, be connected with the base stage of the 3rd triode Q3, the 8th resistance R 8 is the base stage current-limiting resistance of the 3rd triode Q3, the other end ground connection of the 6th capacitor C 6; The grounded emitter of the 3rd triode Q3, the collector electrode of the 3rd triode Q3 is connected with the input of protection tube D12 through the 9th resistance R 9, and is connected with the end of relay TLY1 through the tenth resistance R 10; The other end of relay TLY1 is connected output and all is connected with auxiliary power supply end VCC with protection tube D12; The contact of relay TLY1 is connected with the primary coil of transformer T1, and another contact of relay TLY1 is connected with load supplying end 300.
In the present embodiment; from the control signal of controller 240 output, through the logical interchange stopping direct current effect of the 5th capacitor C 5, export the control signal that exchanges to detection tube D11 after; be 6 chargings of the 6th capacitor C; produce direct current at the 6th capacitor C 6 two ends, drive the 3rd triode Q3 conducting, the contact adhesive of control relay TLY1; to load out-put supply output voltage; be load supplying, the coil of protection tube D12 protection relay TLY1 is not burned it.Present embodiment hinders when not working for some reason at controller 240, and relay TLY1 quits work immediately, and off-state is recovered in the contact of relay TLY1, cuts off load supplying, ensures the safe handling of fresh-keeping device.
In the present embodiment, the operation principle of fresh-keeping device power control circuit 200 specifically describes as follows:
When connecting alternating current, alternating current is from power input 100 inputs, after the rectification of input rectifying filter circuit 210, alternating current is converted to direct current, and after filtering the power input voltage of the direct current of stable output to drive circuit 220, when power input voltage reaches so that during the pressure drop of bidirectional diode DA1 conducting bidirectional diode DA1 conducting, power input voltage is added to the base stage of the first triode Q1, drives the second triode Q2 conducting; The electric current alternating current mistake that both forward and reverse directions is arranged at the tertiary coil TA3 of inductor TA, at the first coil TA1 of inductor TA and the driving signal of the second coil TA2 generation out of phase, driven the first triode Q1 and the second triode Q2 conducting, keep drive circuit 220 work, the driver output electric power output voltage; 230 pairs of electric power output voltages of voltage detecting circuit detect, first with rectification and the filtering of electric power output voltage through output rectification filter unit 231, the electric power output voltage that exchanges is converted to direct current, in detecting unit 232, pass through again the dividing potential drop effect of the 6th resistance R 6 and the 7th resistance R 7, detection signal is exported to the A/D mouth of controller 240; Controller 240 carries out reading this detection signal after the A/D conversion process, and whether the amplitude of judging detection signal surpasses the output voltage preset value, if the amplitude of detection signal reaches the voltage preset value, judge that then output power of power supply and output current normally export, the output control signal, after the detection tube D11 detection in output control circuit 250, be 6 chargings of the 6th capacitor C, produce the control signal of direct current at the 6th capacitor C 6 two ends, be added to the base stage of the 3rd triode Q3, drive the 3rd triode Q3 conducting, the contact adhesive of relay TLY1, at the electric power output voltage that transformer T1 primary coil is exported, be load supplying by load supplying end 300; If the amplitude of detection signal is less than the output voltage preset value, judge that then output power of power supply surpasses the power output preset value, output current surpasses the output current preset value, then controller 240 is not exported control signal, drive the 3rd triode Q3 cut-off, the contact of relay TLY1 disconnects, and the output voltage of cutting off the electricity supply is exported to load, reaches the power output of control fresh-keeping device power supply and the purpose of output current.
The fresh-keeping device power control circuit 200 that the present invention proposes carries out rectification by input rectifying filter circuit 210 with the power input voltage that exchanges, and is converted to direct current; Drive circuit 220 is according to the power input voltage of direct current, the driver output electric power output voltage; Voltage detecting circuit 230 detects electric power output voltage, and output detection signal; Controller 240 reads detection signal, and according to the amplitude of detection signal, the output control signal; Output control circuit 250 is according to control signal, and the control electric power output voltage is exported to load.The present invention increases voltage detecting circuit 230 at power output end, the power output of fresh-keeping device power supply is kept less than 100W, output current is kept less than 8A simultaneously, realize in real time power output and the output current of control fresh-keeping device power supply, so that the fresh-keeping device power supply meets the requirement of UL1310 CLASS TWO safety certification.Circuit of the present invention and apparatus structure are simple and reliable simultaneously, are easy to realize.
The present invention also proposes a kind of fresh-keeping device power control, this fresh-keeping device power control comprises the fresh-keeping device power control circuit, the circuit structure of this fresh-keeping device power control circuit is identical with circuit structure and the operation principle of fresh-keeping device power control circuit 200 described above with operation principle, repeats no more herein.
The present invention further also proposes a kind of control method of fresh-keeping device power control.
With reference to Fig. 4 and Fig. 5, Fig. 4 is the schematic flow sheet of the control method preferred embodiment of fresh-keeping device power control of the present invention; Fig. 5 is the schematic flow sheet of control method step S30 one embodiment of fresh-keeping device power control of the present invention.
In the embodiment of the invention, the control method of fresh-keeping device power control may further comprise the steps:
Step S10: the input rectifying filter circuit carries out rectification with the power input voltage that exchanges, and is converted to direct current;
Step S20: drive circuit is according to the power input voltage of direct current, the driver output electric power output voltage;
Step S30: voltage detecting circuit detects electric power output voltage, and output detection signal;
Step S40: controller reads detection signal, and according to the amplitude of detection signal, the output control signal;
Step S50: output control circuit is according to control signal, and the control electric power output voltage is exported to load.
Preferably, step S30 comprises:
Step S31: the output rectification filter unit carries out rectification with the electric power output voltage that exchanges, and is converted to direct current;
Step S32: detecting unit detects the electric power output voltage of direct current, output detection signal.
The control method of the fresh-keeping device power control that the present invention proposes is carried out rectification by the input rectifying filter circuit with the power input voltage that exchanges, and is converted to direct current; Drive circuit is according to the power input voltage of direct current, the driver output electric power output voltage; Voltage detecting circuit detects electric power output voltage, and output detection signal; Controller reads detection signal, and according to the amplitude of detection signal, the output control signal; Output control circuit is according to control signal, and the control electric power output voltage is exported to load.The control method simple possible that the present invention proposes, increase voltage detecting circuit at power output end, but the control program of online modification controller, the power output of fresh-keeping device power supply is kept less than 100W, output current is kept less than 8A simultaneously, realize in real time power output and the output current of control fresh-keeping device power supply, so that the fresh-keeping device power supply meets the requirement of UL1310 CLASS TWO safety certification.
The above only is the preferred embodiments of the present invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. a fresh-keeping device power control circuit is connected between power input and the load supplying end, comprises input rectifying filter circuit, drive circuit, controller and output control circuit, it is characterized in that, also comprises voltage detecting circuit;
The input of described input rectifying filter circuit is connected with described power input, the output of described input rectifying filter circuit is connected with the input of described drive circuit, the output of described drive circuit respectively with the input of described voltage detecting circuit be connected the input of output control circuit and be connected; The output of described voltage detecting circuit is connected with the test side of described controller, and the control end of described controller is connected with the control end of described output control circuit, and the output of described output control circuit is connected with described load supplying end; Wherein:
The power input voltage that described input rectifying filter circuit is used for exchanging carries out rectification, is converted to direct current;
Described drive circuit is used for the described power input voltage according to direct current, driver output electric power output voltage;
Described voltage detecting circuit is for detection of described electric power output voltage, and output detection signal;
Described controller is used for reading described detection signal, and according to the amplitude of described detection signal, output control signal;
Described output control circuit is used for according to described control signal, controls described electric power output voltage and exports to load.
2. fresh-keeping device power control circuit as claimed in claim 1, it is characterized in that described input rectifying filter circuit comprises fuse, piezo-resistance, the first diode, the second diode, the 3rd diode, the 4th diode, the first resistance, the second resistance and the first electric capacity; Wherein:
One end of described fuse is connected with the live wire end of described power input, and the other end of described fuse is connected with the zero line side of described power input through described piezo-resistance; Described the first diode and described the second diode series arm are in parallel with described the 3rd diode and described the 4th diode series arm, and be connected across between the live wire end and zero line side of described power input, the conducting direction of described the first diode and described the second diode is opposite, and the conducting direction of described the 3rd diode and described the 4th diode is opposite; Described the first resistance and described the second resistance and described the first capacitances in series branch circuit parallel connection, described the first resistance be connected the second resistance common port and described the first diode be connected the common port of the second diode and be connected, described the first resistance be connected the first electric capacity common port and described the 3rd diode be connected the common port of the 4th diode and be connected.
3. fresh-keeping device power control circuit as claimed in claim 2, it is characterized in that described drive circuit comprises a two-way diode, the first triode, the second triode, the 3rd resistance, the 4th resistance, the 5th diode, the 6th diode, the second electric capacity, the 3rd electric capacity, an inductor and a transformer; Wherein:
The collector electrode of described the first triode and described the first resistance be connected the common port of the second resistance and be connected, be connected in after the first coil of described the 3rd resistance and described inductor is connected mutually between the base stage and emitter of described the first triode, described the 5th diode is connected between the collector and emitter of described the first triode; Described the 4th resistance be connected the base stage that is connected in described the second triode after the second coil of inductor is connected mutually and be connected with emitter, described the 6th diode is connected between the collector and emitter of described the second triode; The input of described bidirectional diode and described the first resistance be connected the common port of the first electric capacity and be connected, output and described the 4th resistance be connected the common port of the second coil of inductor and be connected; One end of the primary coil of described transformer is through the tertiary coil of described inductor, respectively with the emitter of described the first triode be connected the collector electrode of the second triode and be connected, the other end of the primary coil of described transformer is connected with the collector electrode of described the first triode through described the second electric capacity, and is connected with the emitter of described the second triode through described the 3rd electric capacity; The two ends of the secondary coil of described transformer are connected with the input of described voltage detecting circuit.
4. such as claim 1 or 3 described fresh-keeping device power control circuits, it is characterized in that described voltage detecting circuit comprises output rectification filter unit and detecting unit;
The input of described output rectification filter unit is as the input of described voltage detecting circuit, be connected in the two ends of described transformer secondary output coil, the output of described output rectification filter unit is connected with the input of described detecting unit, the output of described detecting unit is connected with the test side of described controller as the output of described voltage detecting circuit; Wherein:
The described electric power output voltage that described output rectification filter unit is used for exchanging carries out rectification, is converted to direct current;
Described detecting unit is used for the described electric power output voltage of direct current is detected output detection signal.
5. fresh-keeping device power control circuit as claimed in claim 4 is characterized in that, described output rectification filter unit comprises the 7th diode, the 8th diode, the 9th diode, the tenth diode, the 4th electric capacity and the 5th resistance; Wherein:
Described the 7th diode and described the 8th diode series arm are in parallel with described the 9th diode and described the tenth diode series arm, and be connected across the two ends of described transformer secondary output coil, the conducting direction of described the 7th diode and described the 8th diode is opposite, and the conducting direction of described the 9th diode and described the tenth diode is opposite; One end of described the 4th electric capacity and described the 7th diode be connected the common port of the 8th diode and be connected, the other end and described the 9th diode be connected the common port of the tenth diode and be connected; Described the 5th resistance and described the 4th Capacitance parallel connection, a common port are connected another common end grounding as the output of described output rectification filter unit with the input of described detecting unit.
6. fresh-keeping device power control circuit as claimed in claim 5 is characterized in that, described detecting unit comprises the 6th resistance and the 7th resistance; One end of described the 6th resistance is as the input of described detecting unit, with described the 4th electric capacity be connected a common port of the 5th resistance and be connected; One end of described the 7th resistance and the other end of described the 6th resistance, and as the output of described detecting unit, be connected the other end ground connection of described the 7th resistance with the test side of described controller.
7. such as claim 1 or 6 described fresh-keeping device power control circuits, it is characterized in that described output control circuit comprises the 5th electric capacity, the 6th electric capacity, a detection tube, a protection tube, the 3rd triode, a relay and auxiliary power supply end; Wherein:
One end of described the 5th electric capacity is connected with the control end of described controller, and the other end is connected with the input of described detection tube; Described the 6th electric capacity is connected in the first output and second output of described detection tube, and an end of described the 6th electric capacity is connected other end ground connection with the base stage of described the 3rd triode; The grounded emitter of described the 3rd triode, the collector electrode of described the 3rd triode respectively with the input of described protection tube be connected an end of relay and be connected; The other end of described relay be connected the output of protection tube and all be connected with described auxiliary power supply end; One contact of described relay is connected with the primary coil of described transformer, and another contact is connected with described load supplying end.
8. a fresh-keeping device power control is characterized in that, comprises each described fresh-keeping device power control circuit in the claim 1 to 7.
9. the control method of a fresh-keeping device power control is characterized in that, may further comprise the steps:
Step S10: the input rectifying filter circuit carries out rectification with the power input voltage that exchanges, and is converted to direct current;
Step S20: drive circuit is according to the described power input voltage of direct current, driver output electric power output voltage;
Step S30: voltage detecting circuit detects described electric power output voltage, and output detection signal;
Step S40: controller reads described detection signal, and according to the amplitude of described detection signal, the output control signal;
Step S50: output control circuit is controlled described electric power output voltage and is exported to load according to described control signal.
10. control method as claimed in claim 9 is characterized in that, described step S30 comprises:
Step S31: the described electric power output voltage that the output rectification filter unit will exchange carries out rectification, is converted to direct current;
Step S32: detecting unit detects output detection signal to the described electric power output voltage of direct current.
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| CN201210539396.8A CN103051206B (en) | 2012-12-13 | 2012-12-13 | Fresh-keeping device power control circuit, device and control method thereof |
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| CN201210539396.8A CN103051206B (en) | 2012-12-13 | 2012-12-13 | Fresh-keeping device power control circuit, device and control method thereof |
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| CN103051206B CN103051206B (en) | 2015-11-18 |
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| CN103051206B (en) | 2015-11-18 |
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